Defeating a nice series

Prof. DrAcuLA had done a nice km series; pretty nice to whom´re learning keygenning... some buggy and not soo crypto... but anyways nice...

Cryptok KeygenMe {1} by Prof. DrAcULA

Ok, the first of the series gives to crackers a cast-128(encryption), and base64(encoding) algos to beat. Pretty hard to newbies but not hard at all.
There is also a crappy bug.

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Cryptok KeygenMe {2} by Prof. DrAcULA

This one give us two challenges: make a keygen and a loader. First challenge put us infront of crc32, and sha256 (hash); second challenge is to show in a dialog a bitmap. I didnt solve the 2nd cuz i dont know how to... :(... anyway nice one.

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Cryptok KeygenMe {3} by Prof. DrAcULA

Third one looks pretty nice but it has a serious bug and cannot be keygenned... MD5, bignums, crc16.

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Cryptok KeygenMe {4} by Prof. DrAcULA

Last one is keyfile-based and is very easy. crc32.

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